Furnace grate bar



sept. 15, 1931. H. B.. BRYD'ON 1,823,235l

FURNACE GATE BAR v Filed Nov. 5, 1928 J,1 nl

Patented Sept. 15, 1931 UNITED STATES PATENT oFFlcE HERBERT BOYD BRYDON, OF OAK PARK, ILLINOIS, ASSIGNOR ',140 ERNEST E. LEE CO.,

, OF CHICAGO, ILLINOIS, A CORPORATION OFLILLINOIS FURNACE GRATE BAR Application inea November 5, 192s. serial No. 317,292.

My invention relates to furnaces and particularly to the grate bars employed therein. The object of my invention is to provide a cheap, simple and efficient form of grate bar which can be readily applied to or disconnected from a furnace and one in which the fuel, such as coal, carbon dust, saw dust, saw mill refuse, planing mill refuse and the like is prevented from falling through the air openings in the grate bars by means of longitudinal members which may be substantially of prismoidal, semi-circular, semi-oval or other convenient shape suitably disposed over the air openings .whereby the air may be distributed substantially uniformly to the fuel resting upon the grate bars so that, a thorough burning of the fuel may be obtained.

The construction of the grate bar whereby the air is supplied to the upper side thereof to secure proper combustion will readily be appreciated as the same becomes better understood by reference to the following description and the accompanying drawings, in which F igure 1 is a partial plan View of a form of my improved grate-bar with a portion of the longitudinal member therein shown of prismoidal shape broken away g Fig. 2 is a vertical sectional View of the same on the line 2-2 of Fig. 3;

Fig. 3 is a partial side view with a portion broken away to show a fragmentary longitudinal section through one of the prismoidal members; y

Fig. 4 1 is a fragmentary perspective View of a. form of my improved grate bar;

Fig. 5 is a vertical sectional view on the line 5-5 of Fig. 6 showing a modified form of bar embodying the principles of my invention; and i Fig. 6 is a partial side view of the form of grate bar shown in Fig. 5.

Like symbols of reference herein indicate z like parts in each of the figures of the drawings.

As illustrated in the drawings, the grate bar has two prismoidal members 7 and Q which extend longitudinally the full extent of the has a depending flange 9 and 11, respectively while a portionv12 extends across the end of said bar between the flanges 9 and 11 to form air chambers 13 and 14 beneath the prismoidal members 7 and 8.

The bar is provided with a plurality of spaced transverse openings 16, which extend through a portion of the flanges 9 and 11 and through the bottom of the prismoidal members 7 and 8, while the outer end of each of said prismoidal membersis cut away, as at 17 and 18 and a portion 19 between the same is also cutaway, so as to make direct communication with the transverse openings 16 and thus permit the air from the chambers 13 and 14 to pass outward and upward through the fuel resting on said bars and thus insure perfect combustion of the same.

At a point midway between the flanges 9 and 11, lso as to be positioned immediately beneath the expanded V-shaped opening 21 between the prismoidal members 7 and 8, is a. rib 22, as shown in Figs. 2 and 3, which gradually increases in depth from its outer end 23 to the center 24 of the said bar, so as to increase the strength of said bar and insure its ability to carry the load of fuel placed thereon.

The bars are adapted to rest upon any suitable form of bearer such, for instance, as that shown in dotted lines in Fig. 3 to which the numeral 26 has been applied or may be arranged to be rocked to dispel the ashes and clin (ers therefrom.

Figs. 5 and 6, showing the modification, merely dispense with the use of the rib 22 and increase the depth of the flanges 9 and 11, so as to obtain the required rigldity and carrying capacity through the flanges.

It will readily be seen that in the use of my improved grate bar air from beneath the com bustion chamber can be suppliedthereto at all times in the direction shown by the course of the arrows in Fig. 5. The bar in section is substantially the shape of the letter M and the openings 16 extend through each of the legs, so as to communicate freely with the openings provided by cutting away the por tions 17, 18 and 19 of the prismoidal members.

My invention is very simple in construction, being made of one casting, with the openings cored out, and is, therefore, very durable, assures a thorough distribution of air over the grate area and is well adapted for 5 the purposes for which it is designed.

It will also be understood that while I have described a single bar showing two prismoidal members, numerous bars may be plaeed sideby-side, and any number of prismoidal members may be cast on any of the bars, so that while I have shown a preferred embodiment of my invention, it should be understood that the details of construction are capable of wide modification and variation without departing from the spirit of the invention or sacrificing any of the advantages thereof; hence, I reserve all such variations and modifications as may fall within the spirit and purviewof the appended claim. I claim:

A grate bar substantially M-shape in crosssect-ion providing a pair of air chambers between the legs thereof, said bar having a plurality of transverse openings extending through all of said legs and communicating with said air chambers to form a pair of spaced portions of substantially triangular cross-section of which the bases lie in the same plane, the material of the legs bounding'the l side of the transverse openings opposite to said spaced triangular portions lying in a single plane substantially parallel to and hav-` ing an overlapping relation with the bases of said latter portions whereby air from said chambers may communicate freely with fuel on said grate bar and said fuel will be prevented from falling through said grate bar.

In witness whereof, I have hereunto subscribed my name. 4o HERBERT BOYD BRYDON. 

